Kenny Meyer (knny.m...@gmail.com) wrote:
> Hello,
>
> I have two models, 1) FlashCard and 2) Practice, and I have a generic relation
> in the FlashCard model pointing to the Practice model using the contenttypes
> framework.
> The Practice model tracks information like how many times something was
> practiced, and calculates an `easy factor'.
> Each time I save a FlashCard I want at the same time to create Practice
> object for the flashcard, automatically.
>
>
> class Practice(models.Model):
> content_type = models.ForeignKey(ContentType)
> object_id = models.PositiveIntegerField()
> item = generic.GenericForeignKey('content_type', 'object_id')
>
> user = models.ForeignKey(User)
>
>
> class FlashCard(models.Model):
> """
> A basic Flashcard.
>
> Has a front and a back view.
> """
> front = models.TextField(
> max_length = 255,
> verbose_name = "Front")
> back = models.TextField(
> max_length = 255,
> verbose_name = "Back")
> user = models.ForeignKey(User)
> practice = generic.GenericRelation(Practice)
>
>
> I read the contenttypes documentation, and as far as I understand to create a
> related Practice object for a flashcard instance I should do the following:
>
> >>> user = User.objects.get(username="kenny")
> # Create a sample flashcard
> >>> flashcard = ("bla", "bla", user)
> # ...and create a Practice object for it
> >>> new_practice = Practice(item=flashcard)
> # then I try to save it, but that fails with a large backtrace
> >>> new_practice.save()
> [snip]
>
> Here the actual backtrace: http://dpaste.com/hold/272617/
Ok, this is my error. Creating a flashcard was actually this:
FlashCard(front="front side", back="back side", user)
then it worked, and so I could also create a Practice object.
> Well, but this is not the reason I opened this thread. Still I want to create
> Practice object for my FlashCard object.
>
> I started a research on Google, but I really haven't found anything really
> helping me to do that.
>
> Can you guys give me a helping hand on this with your expertise, please?
>
> Additional information about my environment:
> - Django 1.2.3
> - PostgreSQL 8.4.5
>
> Cheers,
> Kenny
>
> --
> - Kenny Meyer <knny.m...@gmail.com>
> To understand recursion, we must first understand recursion.
> --
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